Tests fails with hwdb / systemd >= 240 (Goldstar now LG)
We noticed downstream that gnome-settings-daemon failed to build for us (because of a failing test), see https://bugs.debian.org/917708
This is apparently caused by an update to hwdb first shipped in systemd 240: https://github.com/systemd/systemd/commit/c6d7a5e9a3836f837cd3574495f54637073325ee#diff-cc577494a2dc10ea97b0dc2551908c80
I proposed a lazy/temporary fix downstream that will get the package building again: https://salsa.debian.org/gnome-team/gnome-settings-daemon/merge_requests/2 ... but you likely want to add a check both for old and new name so you can build with whatever version of systemd instead.